玉米秸秆纤维与玄武岩纤维加固水泥土力学性质对比分析

吉林省处于世界"三大黄金玉米带"地域之一,季节性秸秆过剩问题比较突出。为了拓宽其消化渠道,将短切玉米秸秆纤维按不同比例掺入取自长春地区的黄土中,基于无侧限抗压强度试验,探明其对水泥土加固效果的影响规律,通过与玄武岩纤维水泥土试验数据的对比分析,主要研究两种纤维水泥土强度、应力应变关系随纤维掺入比或纤维长度的演化规律,深入分析了界面剪切强度和软弱结构面等对强度的影响。试验结果表明:玉米秸秆纤维和玄武岩纤维均能提高水泥土强度,增强其延性,两种纤维水泥土强度发展规律相似,均呈现先增大后减小的特点;试验条件下,峰值强度、最优纤维掺入比和最佳纤维长度均基本相同。试验表明玉米秸秆纤维替代玄武岩纤维应用于水泥土加固具有一定的可行性,但玉米秸秆纤维的防腐和耐久性问题需进一步深入研究。

Comparative Analysis of Mechanical Properties of Cemented Soil Reinforced by Corn Straw Fiber and Basalt Fiber

Jilin Province is one of the "Three Golden Corn Belts" in the world, and the problem of seasonal straw surplus is quite prominent. In order to broaden the use of corn stalk, chopped corn stalk fiber with different proportions was mixed into the soil from Changchun area. Based on the unconfined compressive strength tests, the characteristics of its influence on the reinforcement effect of cement soil were explored. Through comparative analysis with basalt fiber reinforced cemented soil, the evolution law of the strength and stress-strain relationship of two kinds of fiber reinforced cemented soil with fiber contents and fiber lengths was studied, and the effects of interfacial shear strength and weak structure surface on the strength were deeply analyzed. The results show that both corn straw fiber and basalt fiber can improve the strength and ductility of cemented soil. The strength development law of these two kinds of fiber reinforced cemented soil is similar, both show the characteristics of increasing first and then decreasing. Under the experimental conditions, the peak strength, the optimal fiber incorporation ratio and the optimal fiber length are basically the same. The experiment result shows that it is feasible to replace basalt fiber with corn stalk fiber in cemented soil reinforcement, but the corrosion resistance and durability of corn stalk fiber need to be further studied.